CN112088035A - Badminton racket - Google Patents

Badminton racket Download PDF

Info

Publication number
CN112088035A
CN112088035A CN201980027857.3A CN201980027857A CN112088035A CN 112088035 A CN112088035 A CN 112088035A CN 201980027857 A CN201980027857 A CN 201980027857A CN 112088035 A CN112088035 A CN 112088035A
Authority
CN
China
Prior art keywords
racket
shaft
diameter
frame
badminton
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201980027857.3A
Other languages
Chinese (zh)
Inventor
大谷和也
佐野彰则
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yonex KK
Original Assignee
Yonex KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2018-086420 priority Critical
Priority to JP2018086420A priority patent/JP2019187965A/en
Application filed by Yonex KK filed Critical Yonex KK
Priority to PCT/JP2019/016399 priority patent/WO2019208345A1/en
Publication of CN112088035A publication Critical patent/CN112088035A/en
Pending legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00Stringed rackets, e.g. for tennis
    • A63B49/02Frames
    • A63B49/10Frames made of non-metallic materials, other than wood

Abstract

The invention provides a badminton racket which can avoid the insufficient strength of a racket rod and realize the reduction of the diameter of the racket rod. The racket (10) of the present invention includes a frame (13) extending annularly, a handle (11), and a shaft (12) connecting the frame and the handle. The racket shaft is formed of a fiber-reinforced resin to be solid. The blade shaft is formed in a substantially circular shape in a cross-sectional view on a plane perpendicular to the extending direction, and the diameter dimension thereof is set to be 5.7mm to 6.2 mm.

Description

Badminton racket
Technical Field
The invention relates to a badminton racket with a racket shaft.
Background
When playing badminton, a player plays a game by hitting the badminton by swinging a racket. For example, as disclosed in patent document 1, a racket of a badminton includes a shaft extending linearly to connect a handle and an annular frame, and the frame and the shaft are formed of a fiber-reinforced resin.
Documents of the prior art
Patent document
[ patent document 1 ] Japanese patent application laid-open No. 11-262545
Disclosure of Invention
Problems to be solved by the invention
In the shaft of the racket disclosed in patent document 1, since the fiber-reinforced resin is formed in a hollow cylindrical shape, the outer diameter is set to 6.4mm or more in order to ensure both strength and performance. On the other hand, it is desired to reduce the air resistance at the time of the swing by making the shaft thin (reducing the outer diameter dimension) to increase the swing speed and optimize the swing performance, but it is difficult to secure the strength to withstand the actual game when the diameter is small.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a badminton racket in which the shaft can be made smaller while avoiding insufficient strength of the shaft.
Means for solving the problems
A badminton racket comprising a frame extending annularly, a handle, and a shaft connecting the frame and the handle, characterized in that the shaft is formed of a fiber-reinforced resin and is solid, and has a substantially circular shape in cross-section in a plane perpendicular to the direction of extension, and the diameter is set to be 5.7mm to 6.2 mm.
According to this configuration, the blade shaft is formed of a solid fiber-reinforced resin and has the outer diameter as described above, so that both the strength of the blade shaft and the diameter reduction of the blade shaft can be achieved. This makes it possible to provide durability required for a game and to reduce air resistance of the racket shaft at the time of swinging to improve the swinging performance.
In the present invention, it is preferable to set the diameter size of the cross section to about 6 mm. With this configuration, the strength of the racket shaft can be ensured and the swing performance can be improved by reducing the diameter of the racket shaft with a good balance.
Effects of the invention
According to the present invention, the racket shaft can be reduced in diameter while avoiding insufficient strength of the racket shaft.
Drawings
Fig. 1 is a front view of a racket according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view of the racket shaft taken along the line a-a of fig. 1.
Fig. 3 is a graph showing the relationship between the outer diameter dimension and the flexural strength of the racket shaft of the embodiment and the comparative example.
Fig. 4 is an explanatory view of an experiment for measuring the deflection amount of the racket of the example and the comparative example.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Fig. 1 is a front view of an embodiment badminton racket. In the following drawings, some components are omitted for convenience of explanation.
As shown in fig. 1, a badminton racket (hereinafter, referred to as "racket") 10 includes a handle 11 to be held by a player, a shaft 12 connected to the handle 11 at one end and extending in a linear direction, and a frame 13 connected to the other end of the shaft 12 and having an elliptical ring shape. A racket string 14 is stretched inside the racket frame 13, and a hitting surface 15 for hitting the shuttlecock is formed by the racket string 14.
In the claims and the description of the present specification, unless otherwise specified, as indicated by arrows in fig. 1, the side of the racket frame 13 in the longitudinal direction of the racket 10 is referred to as the front end side, and the side of the handle 11 is referred to as the rear end side. A direction perpendicular to the face 15 is referred to as a front-back direction, and a direction perpendicular to a longitudinal direction on the face 15 (i.e., on a plane along the face 15) is referred to as a left-right direction.
In the handle 11 and the shaft 12, the shaft 12 is inserted into the handle 11 by a predetermined length and is connected in a fixed state by bonding or the like.
The frame 13 is formed of a hollow body having a predetermined wall thickness, and the cross-sectional shape thereof may be circular, elliptical, square, or other various shapes. The frame 13 is formed by internal pressure molding using expansion of a medium such as air. The racket frame 13 may be formed by filling a predetermined foam material into the inside thereof, but the foam material may be partially or entirely omitted from the racket frame 13. In the racket 10, the frame 13 and the shaft 12 are connected by a T-joint (not shown) that is built in them.
Fig. 2 is a cross-sectional view of the racket shaft taken along the line a-a of fig. 1. As shown in fig. 2, the shaft 12 is formed in a substantially circular shape when viewed in cross section on a plane perpendicular to the extending direction. The racket shaft 12 is formed to be solid, including a core 12a positioned on the center side and a tube 12b inserted into the core 12a to form the outer peripheral surface of the racket shaft 12. Both the core portion 12a and the tube portion 12b of the racket shaft 12 are formed of a fiber-reinforced resin containing a reinforcing material formed of fibers.
In the present embodiment, the racket shaft 12 is formed such that the outer diameter thereof is substantially the same from the front end to the rear end. The diameter D of the cross section of the blade rod 12 is set to 5.7mm to 6.2mm, preferably 6.0mm to 6.2mm, and more preferably about 6.0 mm. The reason for this will be described later.
Next, a method for manufacturing a badminton racket according to the present embodiment will be described. First, a resin sheet (carbon sheet) of thermosetting Fiber Reinforced plastic (FRP: Fiber Reinforced Plastics) is prepared. The fiber-reinforced resin is a resin in which reinforcing fibers are mixed with a thermosetting resin such as an epoxy resin or a vinyl ester resin and semi-cured, and the reinforcing fibers may be appropriately selected from carbon fibers, glass fibers, organic fibers, ceramic fibers, and the like. The resin sheet of the present embodiment uses carbon fibers as reinforcing fibers.
In order to mold the racket shaft 12, a plurality of resin sheets are concentrically laminated on a mandrel and heated, and then the mandrel is pulled out to mold the tube portion 12 b. The orientation direction of the carbon fibers in the plurality of resin sheets is an appropriate combination of directions such as the extending direction of the racket shaft 12, a direction perpendicular to the extending direction, and a direction oriented at 45 ° to the extending direction.
Before and after the molding of the tube portion 12b, the core portion 12a is molded by heating and molding a fiber-reinforced resin made of the same material as the resin sheet into a circular shaft shape. Thereafter, the core 12a is inserted into the tube 12b and fixed by adhesion or the like as necessary. The outer diameter of the core 12a and the inner diameter of the tube 12b are set to be substantially the same size, and are formed so that no gap is formed therebetween.
In the above description, the core portion 12a and the tube portion 12b are formed separately when the racket shaft 12 is molded, but the formation of the racket shaft by heat molding a solid shaft-like member having the outer diameter of the racket shaft 12 is not prevented.
Before and after molding of the racket shaft 12, a plurality of resin sheets for the racket frame 13 are laminated to form a resin sheet tube wound in a cylindrical shape so as to mold the racket frame 13. Thereafter, the resin sheet for the racket frame 13 is bent in a ring shape, and a T-joint to which an adhesive is attached to both end portions of the butt joint, and a joint is also attached to the front end side of the tube portion 12b of the racket shaft 12. After the leading end sides of the frame 13 and the shaft 12 to which the joint is attached in this way are set in a metal mold, the metal mold is heated and pressurized to connect the frame 13 with the shaft 12.
Next, an experiment performed on the relationship between the outer diameter dimension of the racket shaft and the amount of deflection will be described with reference to fig. 3. Fig. 3 is a graph showing the relationship between the outer diameter size and the amount of deflection of the racket shaft of the embodiment and the comparative example. In fig. 3, the horizontal axis represents the outer diameter of the racket shaft, and the vertical axis represents the amount (relative value) of deflection of the racket shaft.
In the experiment, as an example, as described in the above embodiment, a racket including a shaft having a solid cross-sectional shape as shown in fig. 2 was produced. In addition, in the experiment, as a comparative example, a racket in which the shaft of the example was changed to a hollow cylindrical shape was manufactured. After molding, the racket shaft of the embodiments is shaped by using a plurality of resin sheets having a bending strength of 1200Mpa to 2000Mpa and a bending elastic modulus of 130Gpa to 230 Gpa. The plurality of resin sheets may have the same bending strength and bending elastic modulus, or may be different from each other as long as they are within the above ranges. After molding, the racket shaft of the comparative example was shaped using a resin sheet having a flexural strength of 1200Mpa to 2100Mpa and a flexural modulus of elasticity of 160Gpa to 230 Gpa.
In each of examples and comparative examples, a racket having a shaft with an outer diameter dimension shown in the horizontal axis of fig. 3 in a range of 5.6mm to 7.0mm was produced. The inner diameter of the shaft of the comparative example racket was set to 2.8 mm.
Fig. 4 is an explanatory view of an experiment for measuring the deflection amount of the racket of the example and the comparative example. As shown in fig. 4, in the present experiment, the grip of the racket was fixed, a predetermined load F was applied to the front end side of the frame, and the amount of deformation in the front-back direction of the front end of the frame before the application of the load F was measured as the amount of deflection. This measurement was performed for each of the racquets in examples and comparative examples, in which the outer diameter of the shaft was replaced as described above, and the value of the deflection when a load F was applied to the racquet in comparative example having an outer diameter of 6.4mm was set to 100, and the deflection of the racquets in other comparative examples and examples was measured as a relative value. The measurement results are shown in the graph of fig. 3.
As can be understood from the graph of fig. 3, in both the example and the comparative example, the larger the outer diameter size of the racket shaft, the smaller the amount of flexure of the racket shaft becomes substantially once (linearly), as the strength of the racket shaft becomes higher.
Here, since the racket having the shaft of 6.4mm in outer diameter size in the comparative example is commercialized and actually used, the racket having the deflection amount of 100 or less satisfies the strength condition of the shaft. Therefore, in embodiments where the racket shaft is solid, the strength condition is met when the outer diameter dimension of the racket shaft is 6.0mm or more. In particular, when the outer diameter of the shaft is 6.0mm to 6.2mm, and more preferably when the outer diameter of the shaft is about 6.0mm, the strength of the shaft can be ensured, the diameter can be made smaller than that of the comparative example in which the outer diameter of the shaft is 6.4mm, the air resistance during swing can be reduced, and the swinging performance can be improved.
Further, the actual trial striking was performed on the racket having the outer diameter size of the shaft of 6.0mm in the comparative example, confirming that it could not be sufficiently exerted due to insufficient strength. In the comparative example in which the outer diameter of the racket shaft is 6.0mm, since the amount of deflection is 123, the strength is insufficient when the amount of deflection is more than 123. Therefore, it is assumed that in the embodiment, the racket shaft having the outer diameter size of the deflection amount of 123 or less satisfies the strength condition. In other words, it is assumed that the strength condition is satisfied when the deflection amount is set to be sufficiently smaller than 123 and the outer diameter dimension is 5.7mm or more in the embodiment. Such an outer diameter size can further reduce air resistance during the swing and further improve the swing performance by further reducing the diameter.
The present invention is not limited to the above embodiment, and can be implemented by being variously modified. In the above-described embodiments, the size, shape, orientation, and the like shown in the drawings are not limited to these, and may be appropriately modified within the range in which the effects of the present invention are exhibited. The present invention can be implemented by making appropriate changes without departing from the scope of the object of the present invention.
For example, the connection between the shaft 12 and the frame 13 is not limited to the joint, and other connection structures may be used as long as the game can be played in the same manner as the racket of the above embodiment.
Industrial applicability
The present invention relates to a badminton racket which can avoid the insufficiency of the strength of a racket rod and realize the reduction of the diameter of the racket rod.
The application is based on Japanese patent application 2018-086420 applied on 27.4.2018. The entire contents of which are incorporated herein.

Claims (2)

1. A badminton racket is characterized by comprising
A racket frame extending in a ring shape, a racket handle, and a racket rod connecting the racket frame and the racket handle,
the racket shaft is formed of a fiber-reinforced resin and is substantially circular in cross-section in a plane perpendicular to the direction of extension, and the diameter of the racket shaft is set to be 5.7mm to 6.2 mm.
2. The badminton racquet of claim 1,
the diameter of the cross section is dimensioned to be about 6 mm.
CN201980027857.3A 2018-04-27 2019-04-17 Badminton racket Pending CN112088035A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2018-086420 2018-04-27
JP2018086420A JP2019187965A (en) 2018-04-27 2018-04-27 Badminton racket
PCT/JP2019/016399 WO2019208345A1 (en) 2018-04-27 2019-04-17 Badminton racket

Publications (1)

Publication Number Publication Date
CN112088035A true CN112088035A (en) 2020-12-15

Family

ID=68294077

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201980027857.3A Pending CN112088035A (en) 2018-04-27 2019-04-17 Badminton racket

Country Status (3)

Country Link
JP (1) JP2019187965A (en)
CN (1) CN112088035A (en)
WO (1) WO2019208345A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4360202A (en) * 1978-09-08 1982-11-23 Lo Kun Nan CFRP or FRP made badminton racket frame
US5071124A (en) * 1990-05-03 1991-12-10 Prince Manufacturing, Inc Badminton racquet
JPH1119251A (en) * 1997-07-02 1999-01-26 Bridgestone Sports Co Ltd Badminton racket

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4360202A (en) * 1978-09-08 1982-11-23 Lo Kun Nan CFRP or FRP made badminton racket frame
US5071124A (en) * 1990-05-03 1991-12-10 Prince Manufacturing, Inc Badminton racquet
JPH1119251A (en) * 1997-07-02 1999-01-26 Bridgestone Sports Co Ltd Badminton racket

Also Published As

Publication number Publication date
WO2019208345A1 (en) 2019-10-31
JP2019187965A (en) 2019-10-31

Similar Documents

Publication Publication Date Title
JP5855861B2 (en) Ball bat including a barrel portion having separate proximal and distal members
RU2403940C2 (en) Construction of hockey stick with multiple tubular structure
US7803063B2 (en) Golf club shaft
US7736245B2 (en) Golf club shaft and golf club
US6908401B2 (en) Shaft for use in golf clubs and other shaft-based instruments and method of making the same
JP2001087436A (en) Golf club shaft
JP2004081230A (en) Golf club shaft
CN112088035A (en) Badminton racket
JP2015231426A (en) Golf club and shaft
KR101238700B1 (en) Badminton Racket
JP2011142973A (en) Golf club shaft and golf club
JP2000233032A (en) Racket frame
US6491778B1 (en) Bent tip composite golf shaft
JP2007252574A (en) Shaft for golf club
JPH06233843A (en) Golf club shaft and its manufacture
JP2005328925A (en) Racket frame
JP2013202250A (en) Golf club shaft and golf club
JP3295905B2 (en) Racket frame
KR20190087666A (en) Golf club
CN112041037A (en) Badminton racket
JP3421324B2 (en) Golf club
JP2002065934A (en) Billiard cue structure
US20030079839A1 (en) Bent tip composite golf shaft
JPH0838659A (en) Shaft for golf club
US20060199680A1 (en) Ball game racquet, especially tennis racquet

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination